Concept Guide
Table 54. Spanning Tree Variations Dell EMC Networking OS Supports
Dell EMC Networking Term IEEE Specication
Spanning Tree Protocol (STP) 802 .1d
Rapid Spanning Tree Protocol (RSTP) 802 .1w
Multiple Spanning Tree Protocol (MSTP) 802 .1s
Per-VLAN Spanning Tree Plus (PVST+) Third Party
Implementation Information
• The Dell EMC Networking OS implementation of PVST+ is based on IEEE Standard 802.1w.
• The Dell EMC Networking OS implementation of PVST+ uses IEEE 802.1s costs as the default costs (as shown in the following table).
Other implementations use IEEE 802.1w costs as the default costs. If you are using Dell EMC Networking systems in a multivendor
network, verify that the costs are values you intended.
• You can enable PVST+ on 254 VLANs. To set up VLANs, refer to Virtual LANs (VLANs).
NOTE: Dell EMC Networking OS supports upto 64 VLANs or instances and the number of virtual ports (number of VLANs *
interface groups) must not exceed 64 in a L2 and L3 scaled environment and 128 in L2 only environment.
Congure Per-VLAN Spanning Tree Plus
Conguring PVST+ is a four-step process.
1 Congure interfaces for Layer 2.
2 Place the interfaces in VLANs.
3 Enable PVST+.
4 Optionally, for load balancing, select a nondefault bridge-priority for a VLAN.
Related Conguration Tasks
• Modifying Global PVST+ Parameters
• Modifying Interface PVST+ Parameters
• Conguring an EdgePort
• Flush MAC Addresses after a Topology Change
• Prevent Network Disruptions with BPDU Guard
• Enabling SNMP Traps for Root Elections and Topology Changes
• Conguring Spanning Trees as Hitless
• PVST+ in Multi-Vendor Networks
• Enabling PVST+ Extended System ID
• PVST+ Sample Congurations
Enabling PVST+
When you enable PVST+, Dell EMC Networking OS instantiates STP on each active VLAN.
1 Enter PVST context.
PROTOCOL PVST mode
Per-VLAN Spanning Tree Plus (PVST+)
673